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Message-ID: <8ca8930e-716c-4c68-8265-f7da2f207400@oracle.com>
Date: Mon, 16 Mar 2026 15:13:46 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: [CVE-2026-3644] CPython Incomplete control character
validation in http.cookies
-------- Forwarded Message --------
Subject: [Security-announce][CVE-2026-3644] Incomplete control character validation in http.cookies
Date: Mon, 16 Mar 2026 17:28:35 +0000
From: Stan Ulbrych via Security-announce <security-announce@...hon.org>
Reply-To: security-sig@...hon.org
To: security-announce@...hon.org
CC: Stan Ulbrych <stanulbrych@...il.com>
There is a MEDIUM severity vulnerability
affecting CPython.
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel,
was incomplete. The Morsel.update(), |= operator, and unpickling paths were not
patched, allowing control characters to bypass input validation. Additionally,
BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
Please see the linked CVE ID for the latest information on
affected versions:
* https://www.cve.org/CVERecord?id=CVE-2026-3644
* https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4
--
Best regards,
Stan Ulbrych.
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